Lamp



FIG. 1 is a perspective view of the new design for a lamp as seen from the rear, side;

FIG. 2 is a side elevational view thereof, views from other sides being the same, the design being rotationally symmetric;

FIG. 3 is a bottom plan view thereof; and,

FIG. 4 is a top plan view thereof.

The broken line disclosure is for environmental purposes only and does not form a part of the claimed design. 

CLAIM The ornamental design for a lamp, as shown and described. 